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I was unable to change the mouse sensitivity after upgrading to Ubuntu 17.04. It was very low/slow after upgrade.

Changing it in the default mouse app didn't do any difference. And xinput didn't work.

I ended up modifying "/sys/devices/platform/i8042/serio1/sensitivity" and changing the value to 220. It worked immediately.

To make the change work after every reboot, edit '/etc/rc.local' and add this line before the command 'exit 0':

echo -n 220 > /sys/devices/platform/i8042/serio1/sensitivity

My '/etc/rc.local' looks like this:

#!/bin/sh -e## rc.local## This script is executed at the end of each multiuser runlevel.# Make sure that the script will "exit 0" on success or any other# value on error.## In order to enable or disable this script just change the execution# bits.## By default this script does nothing.